% \iffalse meta-comment -------------------------------------------------------
% Copyright 2015 Matthias Vogelgesang and the LaTeX community. A full list of
% contributors can be found at
%
%     https://github.com/matze/mtheme/graphs/contributors
%
% and the original template was based on the HSRM theme by Benjamin Weiss.
%
% This work is licensed under a Creative Commons Attribution-ShareAlike 4.0
% International License (https://creativecommons.org/licenses/by-sa/4.0/).
% ------------------------------------------------------------------------- \fi
% \iffalse
%<*package>
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{beamerouterthememetropolis}[2017/01/23 Metropolis outer theme]
%</package>
% \fi
% \CheckSum{0}
% \StopEventually{}
% \iffalse
%<*package>
% ------------------------------------------------------------------------- \fi
%
% \subsection{\themename outer theme}
%
% A |beamer| outer theme dictates the style of the frame elements traditionally
% set outside the body of each slide: the head, footline, and frame title.
%
%
%
% \subsubsection{Package dependencies}
%
%    \begin{macrocode}
\RequirePackage{etoolbox}
\RequirePackage{calc}
\RequirePackage{pgfopts}
%    \end{macrocode}
%
%
%
% \subsubsection{Options}
%
% \begin{macro}{numbering}
%    Adds slide numbers to the bottom right of each slide.
%    \begin{macrocode}
\pgfkeys{
  /metropolis/outer/numbering/.cd,
    .is choice,
    none/.code=\setbeamertemplate{frame numbering}[none],
    counter/.code=\setbeamertemplate{frame numbering}[counter],
    fraction/.code=\setbeamertemplate{frame numbering}[fraction],
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{progressbar}
%    Adds a progress bar to the top, bottom, or frametitle of each slide.
%    \begin{macrocode}
\pgfkeys{
  /metropolis/outer/progressbar/.cd,
    .is choice,
    none/.code={%
      \setbeamertemplate{headline}[plain]
      \setbeamertemplate{frametitle}[plain]
      \setbeamertemplate{footline}[plain]
    },
    head/.code={\pgfkeys{/metropolis/outer/progressbar=none}
      \addtobeamertemplate{headline}{}{%
        \usebeamertemplate*{progress bar in head/foot}
      }
    },
    frametitle/.code={\pgfkeys{/metropolis/outer/progressbar=none}
      \addtobeamertemplate{frametitle}{}{%
        \usebeamertemplate*{progress bar in head/foot}
      }
    },
    foot/.code={\pgfkeys{/metropolis/outer/progressbar=none}
      \addtobeamertemplate{footline}{}{%
        \usebeamertemplate*{progress bar in head/foot}%
      }
    },
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\metropolis@outer@setdefaults}
%    Sets default values for outer theme options.
%    \begin{macrocode}
\newcommand{\metropolis@outer@setdefaults}{
  \pgfkeys{/metropolis/outer/.cd,
    numbering=counter,
    progressbar=none,
  }
}
%    \end{macrocode}%
% \end{macro}
%
%
%
% \subsubsection{Head and footline}
%
% All good |beamer| presentations should already remove the navigation symbols,
% but \themename removes them automatically (just in case).
%
%    \begin{macrocode}
\setbeamertemplate{navigation symbols}{}
%    \end{macrocode}
%
% \begin{macro}{frame numbering}
%    Templates for the frame number. Can be omitted, shown or displayed as a
%    fraction of the total frames.
%    \begin{macrocode}
\defbeamertemplate{frame footer}{none}{}
\defbeamertemplate{frame footer}{custom}[1]{ #1 }
%    \end{macrocode}
%
%    \begin{macrocode}
\defbeamertemplate{frame numbering}{none}{}
\defbeamertemplate{frame numbering}{counter}{\insertframenumber}
\defbeamertemplate{frame numbering}{fraction}{
  \insertframenumber/\inserttotalframenumber
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{headline}
% \begin{macro}{footline}
%    Templates for the head- and footline at the top and bottom of each frame.
%    \begin{macrocode}
\defbeamertemplate{headline}{plain}{}
\defbeamertemplate{footline}{plain}{%
  \begin{beamercolorbox}[wd=\textwidth, sep=3ex]{footline}%
    \usebeamerfont{page number in head/foot}%
    \usebeamertemplate*{frame footer}
    \hfill%
    \usebeamertemplate*{frame numbering}
  \end{beamercolorbox}%
}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
%
%
% \subsubsection{Frametitle}
%
% \begin{macro}{frametitle}
%    Templates for the frame title, which is optionally underlined with a
%    progress bar.
%    \begin{macrocode}
\newlength{\metropolis@frametitle@padding}
\setlength{\metropolis@frametitle@padding}{2.2ex}
\newcommand{\metropolis@frametitlestrut@start}{
  \rule{0pt}{\metropolis@frametitle@padding +%
    \totalheightof{%
      \ifcsdef{metropolis@frametitleformat}{\metropolis@frametitleformat X}{X}%
    }%
  }%
}
\newcommand{\metropolis@frametitlestrut@end}{
  \rule[-\metropolis@frametitle@padding]{0pt}{\metropolis@frametitle@padding}
}
\defbeamertemplate{frametitle}{plain}{%
  \nointerlineskip%
  \begin{beamercolorbox}[%
      wd=\paperwidth,%
      sep=0pt,%
      leftskip=\metropolis@frametitle@padding,%
      rightskip=\metropolis@frametitle@padding,%
    ]{frametitle}%
  \metropolis@frametitlestrut@start%
  \insertframetitle%
  \nolinebreak%
  \metropolis@frametitlestrut@end%
  \end{beamercolorbox}%
}
\setbeamertemplate{frametitle continuation}{%
  \usebeamerfont{frametitle}
  \romannumeral \insertcontinuationcount
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{progress bar in head/foot}
%    Template for the progress bar optionally displayed below the frame title
%    on each page. Much of this code is duplicated in the inner theme's
%    template |progress bar in section page|.
%    \begin{macrocode}
\newlength{\metropolis@progressinheadfoot}
\newlength{\metropolis@progressinheadfoot@linewidth}
\setlength{\metropolis@progressinheadfoot@linewidth}{0.4pt}
\setbeamertemplate{progress bar in head/foot}{
  \nointerlineskip
  \setlength{\metropolis@progressinheadfoot}{%
    \paperwidth * \ratio{\insertframenumber pt}{\inserttotalframenumber pt}%
  }%
  \begin{beamercolorbox}[wd=\paperwidth]{progress bar in head/foot}
    \tikzexternaldisable%
    \begin{tikzpicture}
      \fill[bg] (0,0) rectangle (\paperwidth, \metropolis@progressinheadfoot@linewidth);
      \fill[fg] (0,0) rectangle (\metropolis@progressinheadfoot, \metropolis@progressinheadfoot@linewidth);
    \end{tikzpicture}%
    \tikzexternalenable%
  \end{beamercolorbox}
}
%    \end{macrocode}
% \end{macro}
%
%
%
% \begin{macro}{appendix}
%    Removes page numbering and per-slide progress bars when |\appendix| is
%    called. This makes it easier to include additional ``backup slides'' at
%    the end of the presentation, especially in conjunction with the package
%    |appendixnumberbeamer|.
%    \begin{macrocode}
\AtBeginDocument{%
  \apptocmd{\appendix}{%
    \pgfkeys{%
      /metropolis/outer/.cd,
      numbering=none,
      progressbar=none}
    }{}{}
}
%    \end{macrocode}
% \end{macro}
% \subsubsection{Process package options}
%
%    \begin{macrocode}
\metropolis@outer@setdefaults
\ProcessPgfPackageOptions{/metropolis/outer}
%    \end{macrocode}
%
% \iffalse
%</package>
% \fi
% \Finale
\endinput
